Quantum communication networks offer superior security compared to encryption algorithms we use to protect communication lines today. In the future, such networks will connect remote quantum computers to each other. The European Union has started its European Quantum Communications Infrastructure (EuroQCI) initiative in 2019, and Hungary was among the first countries to join. The aim is to create a pan-European quantum internet with terrestrial and satellite links within ten years. Our goal is a regional quantum network which will be part of the pan-European quantum internet.
Quantum key distribution (QKD) protocols enable distant parties to share secure keys, which can be used for encryption in classical networks. In this process, information is encoded in photons, which can be transmitted over optical fibres or over free-space channels.